From b3e1a6746f77ba7747a19fe7b97ebf8b9fda66e7 Mon Sep 17 00:00:00 2001
From: Matheus Sousa <73663610+MateSousa@users.noreply.github.com>
Date: Sun, 16 Jul 2023 07:51:24 -0300
Subject: [PATCH] Fix don't allow the domain name when creating the cluster
 (#97)

---
 server/cluster.go |  2 +-
 util/network.go   | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/server/cluster.go b/server/cluster.go
index aa4038b4..7748a1af 100644
--- a/server/cluster.go
+++ b/server/cluster.go
@@ -54,7 +54,7 @@ func (req *CreateClusterRequest) validate() error {
 
 	invalidNodes := make([]string, 0)
 	for _, node := range req.Nodes {
-		if !util.IsIPPort(node) {
+		if !util.IsHostPort(node) {
 			invalidNodes = append(invalidNodes, node)
 		}
 	}
diff --git a/util/network.go b/util/network.go
index 2834eca4..8cdc2304 100644
--- a/util/network.go
+++ b/util/network.go
@@ -26,12 +26,13 @@ import (
 	"strings"
 )
 
-func IsIPPort(s string) bool {
+func IsHostPort(s string) bool {
 	parts := strings.Split(s, ":")
 	if len(parts) != 2 {
 		return false
 	}
-	return IsIP(parts[0]) && IsPort(parts[1])
+
+	return (IsIP(parts[0]) || IsDomain(parts[0])) && IsPort(parts[1])
 }
 
 func IsIP(ip string) bool {
@@ -45,3 +46,8 @@ func IsPort(port string) bool {
 	}
 	return p > 0 && p < 65536
 }
+
+func IsDomain(domain string) bool {
+	_, err := net.LookupHost(domain)
+	return err == nil
+}